An employee taps a display to order a coffee at the Barney Barista Bar of the Swiss F&P Robotics company in Zurich, Switzerland, April 16, 2021. Picture taken April 16, 2021. REUTERS/Arnd Wiegmann

A robotic arm prepares a cappuccino at the Barney Barista Bar of the Swiss F&P Robotics company in Zurich, Switzerland, April 16, 2021. Picture taken April 16, 2021. REUTERS/Arnd Wiegmann

An employee taps a display to order a coffee at the Barney Barista Bar of the Swiss F&P Robotics company in Zurich, Switzerland, April 16, 2021. Picture taken April 16, 2021. REUTERS/Arnd Wiegmann

A robotic arm serves a cappuccino at the Barney Barista Bar of the Swiss F&P Robotics company in Zurich, Switzerland, April 16, 2021. Picture taken April 16, 2021. REUTERS/Arnd Wiegmann

A robotic arm prepares a cappuccino at the Barney Barista Bar of the Swiss F&P Robotics company in Zurich, Switzerland, April 16, 2021. Picture taken April 16, 2021. REUTERS/Arnd Wiegmann

A barista works behind the counter taking orders from guests as Farley's Cafe marks its 32nd anniversary with bagpipes, Irish stew, and live music on St. Patrick's Day in San Francisco, California, U.S. March 17, 2021. REUTERS/Brittany Hosea-Small

A barista makes coffee for a customer while wearing a mask as the state of Texas lifts its mask mandate and allows businesses to reopen at full capacity during the coronavirus disease (COVID-19) pandemic in Houston, Texas, U.S., March 10, 2021. REUTERS/Callaghan O'Hare

A barista dressed in a Pennywise clown halloween costume is pictured at a coffee shop in Nonthaburi province ,Thailand, October 31, 2020. REUTERS/Chalinee Thirasupa

A barista dressed in a Pennywise clown halloween costume is pictured at a coffee shop in Nonthaburi province ,Thailand, October 31, 2020. REUTERS/Chalinee Thirasupa

A barista dressed in a Pennywise clown halloween costume is pictured at a coffee shop in Nonthaburi province,Thailand, October 31, 2020. REUTERS/Chalinee Thirasupa TPX IMAGES OF THE DAY

People wearing protective face masks record videos of a robot-barista in Moscow, Russia October 12, 2020. REUTERS/Maxim Shemetov

A barista wearing a protective face mask hands a coffee to a customer from behind a safety takeaway hatch as the National Public Health Emergency Team (NPHET) announced recommendations that the government implement the highest level of COVID-19 restrictions to Level 5, amid the coronavirus disease (COVID-19) pandemic, in Galway, Ireland, October 5, 2020. REUTERS/Clodagh Kilcoyne

A cup for tips with writing saying 'lockdown 2.0 fund' is seen on a counter top as a barista wearing a protective face mask makes a coffee for a customer from behind a safety takeaway hatch as the National Public Health Emergency Team (NPHET) announced recommendations that the government implement the highest level of COVID-19 restrictions to Level 5, amid the coronavirus disease (COVID-19) pandemic, in Galway, Ireland, October 5, 2020. REUTERS/Clodagh Kilcoyne

A barista prepares at coffee at a Greybox Coffee store in Beijing, China, July 6, 2020. Picture taken July 6, 2020. REUTERS/Thomas Peter

An employee stands next to a barista robot that takes orders, makes coffee and brings the drinks straight to customers in Daejeon, South Korea, May 25, 2020. REUTERS/Kim Hong-Ji

Staff of 'Barista' coffee shop waits outside the shop at World Trade Center, after the government announced that private and state companies will reopen their offices after almost two months of lockdown amidst concerns about the spread of coronavirus disease (COVID-19) in Colombo, Sri Lanka May 11, 2020. REUTERS/Dinuka Liyanawatte

A barista wearing a protective face mask and gloves serves takeaway coffee at a cafe amid the coronavirus disease (COVID-19) outbreak in Kiev, Ukraine May 8, 2020. REUTERS/Valentyn Ogirenko

A barista wearing a protective face mask and gloves holds a tray full of pastries at a cafe in Trastevere which reopened for takeaways only, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Rome, Italy May 6, 2020. REUTERS/Guglielmo Mangiapane

A barista wears a protective mask as she serves takeaway coffee at a cafe in Trastevere which reopened for takeaways only, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Rome, Italy May 6, 2020. REUTERS/Guglielmo Mangiapane

A barista wears a protective mask as she prepares takeaway coffee at a cafe in Trastevere which reopened for takeaways only, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Rome, Italy May 6, 2020. REUTERS/Guglielmo Mangiapane

A barista wearing a protective mask takes a coffee cup inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista wearing a protective mask makes a cappuccino inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista wearing protective gloves prepares a macchiato inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

Baristas wearing protective masks talk to their manager inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista wearing a protective mask makes a cappuccino inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista prepares a coffee at a cafe, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Naples, Italy May 4, 2020. REUTERS/Ciro De Luca

Racheal Grina, a barista who has been working as a diet clerk during the pandemic, poses for a portrait at the Swedish Medical Center Issaquah campus during the coronavirus disease (COVID-19) outbreak, in Issaquah, Washington, U.S. April 21, 2020. "I love watching people get healthy. As a diet clerk, they come in at their worst and they leave feeling better," she says. REUTERS/David Ryder

Barista Chen Chao poses for a picture as he waits for customers at a cafe that is closed for regular business but open for takeout in the Wudaoying Hutong, one of the top tourist destinations in Beijing, as the spread of the novel coronavirus disease (COVID-19) continues in China April 10, 2020. Picture taken April 10, 2020. REUTERS/Thomas Peter

Barista Chen Chao serves a customer through the door of a cafe that is closed for regular business but open for takeout in the Wudaoying Hutong, one of the top tourist destinations in Beijing, as the spread of the novel coronavirus disease (COVID-19) continues in China April 10, 2020. Picture taken April 10, 2020. REUTERS/Thomas Peter

A barista puts money back in a box pulled by a rope as a transportation system after a cafe adopted a social distance policy for their customers amid fears of coronavirus outbreak in Bangkok, Thailand March 20, 2020. REUTERS/Chalinee Thirasupa

A barista serves beverages in single use cups inside a Starbucks in London, Britain, March 6, 2020. REUTERS/Henry Nicholls

A barista serves beverages in single use cups inside a Starbucks in London, Britain, March 6, 2020. REUTERS/Henry Nicholls

A barista stands beside an idle coffee machine as he waits for power to return during electrical load-shedding in Cape Town, South Africa, December 11, 2019. REUTERS/Mike Hutchings

A barista stands beside an idle coffee machine as he waits for power to return during electrical load-shedding in Cape Town, South Africa, December 11, 2019. REUTERS/Mike Hutchings

A barista prepares coffee at a store of Juan Valdez in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a store of Juan Valdez in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares cappuccino at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares cappuccino at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

Jenny Qian Zhiya CEO of Luckin Coffee, exchanges high-five with an barista Andrea Lattuada during the company's IPO at the Nasdaq Market site in New York, U.S., May 17, 2019. REUTERS/Brendan McDermid

A barista is pictured at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barista prepares a coffee for online sales at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barista packs a coffee for online sales at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barista delivers a coffee for a customer at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

Baristas work at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barman teacher Tiziano Serangeli realizes an artistic cappuccino, during a lesson at the Mixology Academy Bartendering School in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

A barman teacher Tiziano Serangeli realizes an artistic cappuccino, during a lesson at the Mixology Academy Bartendering School in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

A combo picture shows artistic cappuccinos, realized by a teacher of the Mixology Academy Bartendering School during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

An artistic cappuccino, realized by a teacher of the Mixology Academy Bartendering School is seen during a lesson, in Rome, Italy July 20, 2018. REUTERS/Tony Gentile

Baristas are seen at a new Starbucks Reserve flagship store in Beijing's Qianmen area, China June 30, 2018. REUTERS/Jason Lee

The signs of Starbucks Reserve are seen on the cups as a barista makes drip coffee at its new flagship store in Beijing's Qianmen area, China June 30, 2018. REUTERS/Jason Lee

A barista delivers a drip coffee to a woman at a new Starbucks Reserve flagship store in Beijing's Qianmen area, China June 30, 2018. REUTERS/Jason Lee